1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100101, China
2. Frontier Research Center for the Earth Environment Protection, Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191, Japan
3. Department of Chemistry & Biochemistry, 1455 deMaisonneuve Blvd. West, Concordia University, Montreal, Quebec, Canada H3G 1M8